Cascaded programming with multiple-purpose pins

  • US 6,314,550 B1
  • Filed: 06/09/1998
  • Issued: 11/06/2001
  • Est. Priority Date: 06/10/1997
  • Status: Expired due to Term
First Claim
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1. A method of configuring programmable devices comprising:

  • providing a source of configuration data;

    indicating a first I/O pin of a first programmable device is to be used to output a handshaking signal during a configuration mode of the first programmable device, wherein the first programmable device is coupled to the source of configuration data;

    indicating a second I/O pin of a second programmable device is to be used to receive the handshaking signal from the first programmable device during a configuration mode of the second programmable device;

    configuring the first programmable device with configuration data transferred serially from the source; and

    configuring the second programmable device in response to the handshaking signal from the first I/O pin of the first programmable device and received at the second I/O pin of the second programmable device with configuration data from the source.

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